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方钢管内填混凝土柱(CFSTs)在现代建筑中的使用越来越广泛,与钢柱和混凝土柱相比,其材料性能和功效均有所提高。然而,尽管方钢管混凝土柱的屈曲特性优于中空钢管,由于局部屈曲,其外包钢管截面的高厚比仍受到限制。针对外包钢管带加劲肋的方钢管混凝土柱,提出了一些新的加劲肋形式。为评估这些加劲肋对方钢管混凝土柱力学性能的影响,并与传统加劲肋进行比较,该文对4个带不同加劲肋的方钢管混凝土柱和1个无加劲肋方钢管混凝土柱进行了试验。试验研究了材料的抗力、延性和失效模式等力学性能,为了对试样的综合性能进行预测和总结,也从理论上对这些力学性能进行了研究。为了解各参数对力学性能的影响,该文进行了数值模拟和大量的参数研究,相关学者的试验数据验证了数值分析结果的准确性。基于试验结果和以往的研究,提出了截面强度的设计建议。
Concrete filled square columns (CFSTs) are used more and more widely in modern buildings. Compared with steel columns and concrete columns, CFSTs have improved their material properties and effectiveness. However, although the buckling behavior of CFST columns is superior to that of hollow steel tubes, the thickness-to-thickness ratio of the cross-section of the coated steel tubes is still limited due to the local buckling. Aiming at the square concrete-filled steel tube columns with steel pipe stiffeners, some new forms of stiffener are proposed. In order to evaluate the effect of these stiffeners on the mechanical properties of concrete-filled steel tube columns (CFST), and compared with the traditional stiffeners, four CFST columns with different stiffeners and one CFST column without stiffeners were tested. The mechanical properties such as the resistance, ductility and failure mode of the material were studied experimentally. In order to predict and summarize the comprehensive properties of the samples, these mechanical properties were theoretically studied. In order to understand the influence of various parameters on the mechanical properties, numerical simulation and a large number of parameters were studied in this paper. The experimental data of relevant scholars verified the accuracy of numerical analysis. Based on the test results and previous studies, the design recommendations of the cross-section strength are proposed.